JP4558978B2 - Conduit connection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a conduit connection device for connecting conduits such as upper and lower water pipes and gas pipes or transport conduits for transporting various fluids. It is related with the conduit connection apparatus comprised so that the connection state of this conduit | pipe and a 2nd conduit | pipe could be maintained reliably.
[0002]
[Prior art]
In piping work of various conduits, conduit connection work is performed by various methods depending on the types of conduits to be connected, connection strength conditions, connection sites, and the like. For the conduit, for example, a metal pipe such as a steel pipe, a stainless steel pipe, a copper pipe, or an aluminum alloy pipe, a metal casting pipe, or a resin pipe formed of a vinyl chloride resin or a polyethylene resin is used. For example, a steel pipe or a cast pipe is used as the main pipe conduit having a large diameter and a relatively large internal pressure, and the conduits are connected to each other more directly or through an appropriate connecting pipe member.
[0003]
For example, a large-diameter casting tube has a connecting flange plate having a large number of coupling holes at its connection end, and is integrally formed around the circumference. The connecting flange plate is abutted through an appropriate shield mechanism. Then, a direct connection mechanism is employed in which a bolt is screwed into the coupling hole and coupled. Moreover, the steel pipe etc. employ | adopt the direct connection mechanism which integrates by welding a member equivalent to the flange plate for connection mentioned above to a connection end part, and connects via this connection member.
[0004]
In the conduit, a so-called fitting connection structure with a simple structure is generally adopted in which the end portion of one conduit is fitted and connected to a fitting portion bulging and formed at the other end portion. In such a fitting connection structure, a large-diameter fitting portion bulges out on the second conduit side where the tip portion of the fitting-side first conduit is fitted. In the fitting connection structure, a large number of conduits are directly connected by alternately fitting the fitting portions and the fitting portions of the respective conduits.
[0005]
As another fitting connection structure, the pipe is often cut to an appropriate length according to the field response, so that the connection is made by fitting the ends of the pipe having the same diameter over the entire length. A method using a connecting pipe member in which a portion is formed to bulge at both ends is also employed. In the fitting connection structure, the end portion of the conduit is configured as a fitting portion, and the conduit is sequentially connected via the connecting pipe member by fitting the end portion to the fitting portion.
[0006]
By the way, in the above-mentioned fitting connection structure, when a tensile force in a direction opposite to the fitting direction is applied to each conduit or connecting pipe member due to vibration, ground subsidence, etc., a pipe debonding phenomenon occurs in the connecting portion. There is a problem that it is easy. Therefore, the fitting connection structure is provided with an appropriate detachment prevention mechanism for maintaining the connection state of the conduit or the connecting pipe member. The detachment prevention mechanism is formed, for example, by providing opposing coupling flange plates fixed in the coupling direction on the outer periphery of a conduit or connecting pipe member, and coupling these coupling flange plates with a through bolt or the like. The separation preventing mechanism is assembled in a state in which one side is integrally formed around the circumference of the conduit and the other side is secured by being frictionally coupled to the conduit.
[0007]
On the other hand, the connection structure of the conduit is provided with a sealing structure in which a shield member formed of an elastic material such as rubber is inserted in the coupling part in order to prevent water leakage from the coupling part. In the case of the above-mentioned connection structure such as a cast pipe or a steel pipe, the sealing structure is sealed by inserting an annular shield member between the connection flange plates and tightening the connection flange plate with a bolt. I have to. In addition, in the case of the fitting connection structure, the sealing structure has a cylindrical shield member attached to the outer peripheral portion on the insertion side, and this shield member is closely attached between the outer periphery of the insertion portion and the inner periphery of the fitting portion. Sealing is performed.
[0008]
For example, Japanese Patent Laid-Open No. 10-122455 discloses a first conduit in which a stopper convex portion is formed on an outer peripheral portion on one end side which is an insertion portion and a coupling flange member which is prevented from being removed by the stopper convex portion is combined. And the 2nd conduit | pipe by which the fitting part bulge-formed at the front-end | tip part and the coupling flange part was integrally formed is disclosed. The conduit connection structure of the invention of the prior application is configured as an earthquake-resistant structure type in which the first conduit and the second conduit are prevented from being pulled out, and the coupling flange portion and the coupling flange member are coupled to each other. A through-bolt that maintains the fitting state of the first conduit with respect to the conduit and a push ring member assembled to the through-bolt are provided. In the conduit connection structure of the prior invention, the press ring member moves toward the first conduit by tightening the through bolt and pushes the shield member, thereby preventing the first conduit and the second conduit from being detached. And is configured to be sealed.
[0009]
By the way, in the conduit connection structure of the invention of the prior application, the stopper convex portion for retaining the coupling flange member is fixed to the outer peripheral portion of the first conduit exposed to the outside by welding. There was a problem that the corrosion of the first conduit proceeded from the weld. For example, in order to solve the problem of the conduit connection structure according to the invention of the prior application, the conduit connecting device 100 shown in FIG. One conduit 101 is fitted and connected in a fitting portion 104 formed at the distal end of the second conduit 103, but the first conduit 101 is pulled out by a lock member 105 provided inside the fitting portion 104. Configured to stop.
[0010]
The second conduit 103 is formed with an annular concave groove 106 in the inner peripheral portion of the fitting portion 104, and a ring-shaped centering rubber member 107, a ring-shaped locking member 105, and the like in the concave groove 106. Is assembled. The lock member 105 can be expanded in diameter by forming an axial slit, and the inner diameter in the natural state is substantially equal to the outer diameter of the first conduit 101. In the natural state, the lock member 105 has an inner diameter slightly smaller than the outer diameter of the insertion port convex portion 102 of the first conduit 101. The lock member 105 is combined with the second conduit 103 so that the outer peripheral portion is positioned in the concave groove 106 and the inner peripheral portion protrudes into the inner hole.
[0011]
In the conduit connection device 100, the insertion port convex portion 102 abuts against the lock member 105 when the first conduit 101 is fitted into the fitting portion 104 of the second conduit 103. The lock member 105 expands the diameter by compressing the centering rubber member 107 in the thickness direction as the insertion port convex portion 102 enters. When the insertion opening convex portion 102 passes, the lock member 105 returns to a natural state and is fitted to the outer peripheral portion of the first conduit 101. In this state, the centering rubber member 107 presses the lock member 105 over the entire circumference to the outer peripheral portion of the first conduit 101 to bring it into a centering state.
[0012]
In the conduit connecting device 100, the coupling flange member 108 and the shield member 109 are attached to the first conduit 101. The conduit connecting device 100 is a coupling formed integrally with the coupling flange member 108 of the first conduit 101 and the distal end of the second conduit 103 with the first conduit 101 fitted to the second conduit 103. The flange portion 110 is passed through and tightened with a bolt 111 and a nut 112. In the conduit connecting device 100, the coupling flange member 108 moves toward the coupling flange portion 110 as the nut 112 is tightened, and the shield member 109 is pushed into the fitting portion 104. Seal between the two conduits 103.
[0013]
[Problems to be solved by the invention]
By the way, in the conventional conduit connection device 100 described above, the ring-shaped lock member 105 and the centering rubber member 107 are required, and these members are troublesome to be assembled in the annular groove 106 of the second conduit 103. There is a problem that the cost is increased because the process is required. Further, in the conduit connecting device 100, for example, when re-pipe work is performed, the bolt 111 is removed and the coupling flange member 108 is moved, and then the shield member 109 is pulled out from the second conduit 103 to the first conduit 101. An operation to detube is performed.
[0014]
In the conduit connection device 100, the first conduit 101 cannot be pulled out from the second conduit 103 because the insertion port convex portion 102 hits the lock member 105 and is locked. In the conduit connecting device 100, for this purpose, it is necessary to insert an appropriate jig into the fitting portion 104 and pull out the first conduit 101 while keeping the lock member 105 in an expanded state.
[0015]
In the conduit connecting device 100, as described above, the lock member 105 is in contact with the outer peripheral portion of the first conduit 101 over the entire circumference by the elastic force of the centering rubber member 107. Therefore, in the conduit connecting device 100, the lock member 105 while resisting the elastic force of the centering rubber member 107 within a slight gap between the outer peripheral portion of the first conduit 101 and the inner peripheral portion of the second conduit 103. Therefore, it is necessary to perform an extremely difficult operation such as expanding the diameter over the entire circumference. In addition, the conduit connection device 100 has a problem that a series of operations including such an operation must be performed in a narrow and dark digging groove, and the work efficiency is extremely low.
[0016]
Therefore, the present invention provides a conduit connection device that can reliably maintain the connection state and the sealing state in a simple fitting connection structure such as a conduit, reduce costs, and easily perform the removal work. It was proposed for the purpose of doing.
[0017]
[Means for Solving the Problems]
In the conduit connecting device according to the present invention, which achieves this object, the first conduit and the second conduit are connected in a mating manner. The conduit connecting device includes a shield member that seals between the outer peripheral portion of the first conduit and the inner peripheral surface of the fitting space portion of the second conduit, and the fit between the first conduit and the second conduit. A coupling means for holding the state and for pushing the shield member into the fitting space of the second conduit, a plurality of stopper members assembled inside the second conduit, and the stopper members for the second conduit. And a holding member held inside.
[0018]
In the first conduit on the fitting side, a stopper projection is provided around the circumference on the tip side. The second conduit on the receiving side is formed with a fitting space portion in which the tip portion of the first conduit is fitted to the tip portion, and an annular recess is formed on the inner peripheral surface of the inner position of the fitting space portion. It is formed. The shield member is formed in an overall cylindrical shape by an elastic material, and the outer diameter of the base end portion is slightly larger than the opening diameter of the fitting space portion of the second conduit, and gradually becomes smaller toward the distal end side. It is formed with a thickness. The coupling means includes a first coupling portion provided in the first conduit and a second coupling portion provided in the second conduit. Each stopper member is formed in an arc shape, is held by the holding member, and is accommodated in the annular recess of the second conduit. When the holding member is removed, the stopper member comes out of the annular recess by gravity.
[0019]
According to the conduit connecting device according to the present invention configured as described above, the first conduit is fitted into the fitting space portion of the second conduit to the portion where the stopper convex portion passes through the annular concave portion. According to the conduit connection device, in this state, the holding member is removed from the fitting space portion, so that a part of each lock member is accommodated in the annular recess by gravity and passes through the stopper convex portion of the first conduit. By moving out of the annular recess from the first position allowing the stopper and extending around the outer periphery of the first conduit, the stopper moves to the second position where the stopper protrusion is locked. Each lock member extends to the outer periphery of the first conduit by the operation of a so-called drop key, and prevents the first conduit from coming off by locking the stopper projection.
[0020]
According to the conduit connecting device, the fitting state between the first conduit and the second conduit is maintained by tightening between the connecting portions of the connecting means. According to the conduit connecting device, as the coupling means is tightened, the shield member is gradually pushed into the fitting space portion while being elastically deformed, so that it is between the outer peripheral portion of the first conduit and the inner peripheral portion of the second conduit. Adhere closely to ensure a tight seal between them. Therefore, according to the conduit connection device, the function of preventing the separation between the first conduit and the second conduit and the sealing action between the first conduit and the second conduit are simple in structure and simple. It is surely played by the work.
[0021]
According to the conduit connection device, for example, when re-pipe work or the like is performed, the shield member is extracted from the fitting space with the coupling means being loosened. According to the conduit connecting device, in this state, the jig is inserted into the fitting space portion, and a part of the lock member at the second position is pushed up and moved to the first position. The first conduit is withdrawn from. According to the conduit connecting device, since the locking member is moved to the first position, the stopper protrusion can pass without being locked, and the first conduit is easily pulled out from the second conduit. This is possible. According to the conduit connection device, for example, the lock member can be moved by bringing a magnet or the like close to the outer peripheral portion of the second conduit.
[0022]
According to the conduit connection device, the first conduit is locked to the second conduit by the locking member by a very simple operation of moving a part of the locking member from the second position to the first position against gravity. By performing the state releasing operation, the work efficiency can be greatly improved. According to the conduit connection device, the number of parts can be reduced and the cost can be reduced by eliminating the need for the ring-shaped centering rubber member.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 as an embodiment of the present invention also includes, for example, upper and lower water pipes, conduits through which liquids flow, conduits through which gases such as city gas and cooling gas flow, powders, granules, The present invention is applied as a connecting device for connecting an appropriate conduit such as a conduit through which a solid substance such as a gel-like body flows, and the first conduit 2 is connected to the second conduit 3 by a fitting structure. The conduit connection device 1 is not only a straight pipe but also a spiral pipe suitable for use in, for example, detour piping or other appropriate pipes or pipes and connection pipes. May be.
[0024]
The conduit connection device 1 includes a first conduit 2 and a second conduit made of an appropriate material such as a resin tube formed of vinyl chloride resin or polyethylene resin, a metal tube such as a steel tube, an aluminum alloy tube, or a cast iron tube. Applies to connection with conduit 3. The conduit connection device 1 is applied to connection of the first conduit 2 and the second conduit 3 not only when they are made of the same material but also made of different materials.
[0025]
As will be described in detail later, the conduit connection device 1 ensures that the first conduit 2 and the second conduit 3 connected by a mating structure maintain their mating state even when vibration or the like is applied. The separation preventing function to be performed and a sealing function for maintaining airtightness, watertightness, etc. between the first conduit 2 and the second conduit 3 are simultaneously achieved. In addition, the conduit connection device 1 allows the first conduit 2 and the second conduit 3 to be easily detached, for example, when the re-pipe work or the like is performed, so that the separation preventing function is released by a simple operation. .
[0026]
The conduit connecting device 1 includes a first conduit 2 on the fitting side, a second conduit 3 on the receiving side, a shield member 4 for sealing between the first conduit 2 and the second conduit 3, A coupling mechanism that keeps the fitting state of the first conduit 2 and the second conduit 3 and pushes the shield member 4 into the second conduit 3 is provided. The conduit connection device 1 includes a plurality of stopper members 6 assembled inside the second conduit 3 and a holding seal 7 that holds the stopper members 6 inside the second conduit 3.
[0027]
As shown in FIG. 1 and FIG. 2, the first conduit 2 has a stopper convex portion 8 projecting integrally around the circumference at the tip of the straight pipe. The stopper convex portion 8 is formed with an inclined outer peripheral surface as an inclined guide surface 8a by gradually increasing the diameter from the distal end portion toward the proximal end portion, and the proximal end portion of the inclined guide surface 8a. A step portion 8b perpendicular to is formed. The height of the step portion 8b of the stopper convex portion 8 is generally set to about 3 mm.
[0028]
The first conduit 2 is not limited to the configuration of the stopper protrusion 8 described above. For example, an annular groove is formed in the outer peripheral portion, and a ring-shaped stopper member is fitted in the annular groove. It may be configured. Moreover, the 1st conduit | pipe 2 may comprise not only the stopper convex part 8 but integrally forming over the perimeter of an outer peripheral part, and may be comprised by many convex parts.
[0029]
A coupling ring member 9 constituting a coupling mechanism is attached to the outer periphery of the first conduit 2. The coupling ring member 9 is movable in the axial direction with respect to the first conduit 2 when the inner diameter of the shaft hole 9a is slightly larger than the outer diameter of the stopper projection 8 of the first conduit 2. It is attached to. The coupling ring member 9 is integrally provided with a flange portion 9b extending over the entire outer periphery. A plurality of guide holes 9c are provided in the flange portion 9b at equal intervals in the circumferential direction so as to penetrate in the thickness direction. The coupling ring member 9 has guide holes 9c formed at equal intervals so that when the coupling mechanism is tightened as described later, a uniform tightening force is generated in the circumferential direction.
[0030]
The coupling ring member 9 is integrally formed with a boss-shaped pushing convex portion 9d on the side surface on the stopper convex portion 8 side. The pushing protrusion 9d acts as a portion for pushing the shield member 4 into the second conduit 3 as will be described later. Through bolts 10 constituting a coupling mechanism are inserted into the coupling ring members 9 in the respective guide holes 9c. The coupling ring member 9 is formed as a ring-shaped integral member as a whole. However, it is needless to say that the coupling ring member 9 may be constituted by, for example, a half-structured member.
[0031]
The shield member 4 is attached to the outer periphery of the first conduit 2 located between the stopper projection 8 and the coupling ring member 9. The shield member 4 is formed into an overall cylindrical shape that is tightly fitted to the outer peripheral portion of the first conduit 2 by an elastic material having watertightness or airtightness such as rubber or synthetic rubber. The shield member 4 has a wedge-shaped cross section that gradually decreases in thickness from the base end portion 4a on the coupling ring member 9 side toward the tip end portion 4b. The shield member 4 has a thickness sufficient to fill the gap formed between the first conduit 2 and the second conduit 3 in the filling portion. As will be described later, the side surface of the thick base end portion 4 a is pressed into the second conduit 3 by the shield member 4 being pressed by the pressing convex portion 9 d of the coupling ring member 9.
[0032]
As shown in FIG. 1 and FIG. 2, the second conduit 3 has a fitting portion 11 having a fitting space portion 12 inside by the tip portion of the straight pipe bulging over the entire circumference. It is configured. The fitting portion 11 has a large-diameter opening so that the fitting space portion 12 can easily fit the stopper convex portion 8 of the first conduit 2 and gradually becomes smaller in diameter. The funnel-shaped opening space portion 12a, and an intermediate space portion 12b and a lock space portion 12c that are continuous with the opening space portion 12a.
[0033]
The fitting portion 11 is formed with an inner diameter defined so that the intermediate space portion 12 b of the fitting port 12 forms a gap of about 3 mm to 5 mm between the outer periphery of the first conduit 2. Further, the fitting portion 11 is formed with its inner diameter regulated so that the lock space portion 12c of the fitting port 12 forms a gap of about 1 mm between the stopper convex portion 8 of the first conduit 2. ing. The fitting portion 11 has an opening space portion 12a that has an opening diameter slightly smaller than the outer diameter of the base end portion 4a and larger than the outer diameter of the distal end portion 4b. Has been. In the fitting portion 11, the inner space portion 12 b has an inner diameter slightly smaller than the outer diameter of the shield member 4 with respect to the shield member 4.
[0034]
In the second conduit 3, a flange portion 14 is integrally projected at the tip of the outer peripheral portion of the fitting portion 11 over the entire circumference. The flange portion 14 constitutes a coupling mechanism together with the coupling ring member 9 described above, and a plurality of guide holes 14a having substantially the same diameter as the flange portion 9b and penetrating in the thickness direction are equally spaced in the circumferential direction. Is provided. Each guide hole 14a is formed at a position corresponding to each guide hole 9c on the coupling ring member 9 side, and the tip of the through bolt 10 inserted through these guide holes 9c passes therethrough as described later. Each through-bolt 10 is screwed with a nut 15 at a tip portion that penetrates the guide hole 14a.
[0035]
The second conduit 3 is integrally formed with the flange portion 14 on the outer peripheral portion of the fitting portion 11. For example, the second conduit 3 is configured by a separate member in the same manner as the coupling ring member 9 on the first conduit 2 side described above. Of course, it is also good. The coupling ring member, which is a separate member, is attached to the outer peripheral portion of the second conduit 3 by being prevented from being removed in the axial direction by the fitting portion 11 formed to bulge. The coupling ring member as a separate member may of course be constituted by a half type, and is a stop ring integrated into the outer peripheral portion of the second conduit 3 by welding or the like, or fitted into the outer peripheral portion of the second conduit 3. You may make it hold out by.
[0036]
Further, each through bolt 10 is inserted into each guide hole 9c from the side of the coupling ring member 9 attached to the outer peripheral portion of the first conduit 2, and the guide hole of the flange portion 14 formed integrally with the second conduit 3. Although the nut 15 is screwed into the end portion penetrating 14a, it may be inserted from the second conduit 3 side. Each through-bolt 10 has, for example, a T-shaped head, and the coupling ring of the first conduit 2 in a state in which the tip of the head is prevented from rotating by abutting against the outer periphery of the second conduit 3. The nut 15 is screwed on the member 9 side.
[0037]
The second conduit 3 is formed with an annular recess 13 which is located on the inner peripheral surface of the lock space portion 12c of the fitting portion 11 and has an opening shape sufficient to accommodate the stopper member 6 over the entire circumference. Yes. As shown in FIGS. 1 and 4, three stopper members 6 (6 a to 6 c) are assembled in the annular recess 13 in the second conduit 3. All the stopper members 6 have the same shape and are formed in an arc shape having a curvature substantially equal to the outer peripheral surface of the first conduit 2. As will be described in detail later, each stopper member 6 comes out of the first position housed in the annular recess 13 indicated by the solid line in FIG. 4 and the annular recess 13 indicated by the chain line in the second conduit 3. The member is movable to the second position. In other words, each stopper member 6 acts as a so-called drop key, and locks the first conduit 2 to prevent it from dropping from the second conduit 3.
[0038]
Each stopper member 6 forms a gap between both end portions at the first position accommodated in the annular recess 13, and both end portions protrude from each other at the second position where the stopper member 6 comes out of the annular recess 13. Combined, the length of the annular body having an inner diameter substantially equal to the outer diameter of the first conduit 2. As shown in FIG. 4, the inner peripheral surface of each stopper member 6 is not exposed from the inner peripheral surface of the lock space portion 12 c at the first position accommodated in the annular concave portion 13, and comes out of the annular concave portion 13. It has a thickness sufficient for the outer peripheral side to be present in the annular recess 13 at the second position constituting the annular body.
[0039]
As shown in FIGS. 2 and 3, each stopper member 6 extends over the entire region in the length direction on the inner peripheral edge portion of the side surface facing the intermediate space portion 12 b in the state of being accommodated in the annular recess 13. Each counterbore 16 is formed. Each stopper member 6 acts as a guide for the counterbore 16 to move from the second position to the first position when the first conduit 2 is removed from the second conduit 3 as will be described later. To do.
[0040]
The stopper member 6 is constituted by the three stopper members 6a to 6c formed in an arc shape, but may be at least two or more. If there are too many stopper members 6, the assembly to the second conduit 3 is troublesome, and the possibility of falling off during transportation and the like increases. Therefore, the number of the stopper members 6 is preferably about 2 to 4.
[0041]
As shown in FIG. 1, each stopper member 6 is dropped by a holding seal 7 attached to the inner peripheral surface of the lock space portion 12c so as to close the annular recess 13 in the state of being accommodated in the annular recess 13. Is prevented. The holding seal 7 may be held so that each stopper member 6 does not fall apart and fall off from the annular recess 13 when the second conduit 3 is transported. For example, a vinyl tape or the like is used. Of course, the holding seal 7 is made thinner than the gap formed between the inner peripheral surface of the lock space portion 12c and the stopper convex portion 8, that is, 1 mm. Since the holding seal 7 is extracted when connecting the first conduit 2 to the second conduit 3 as will be described later, for example, a guide piece that is pulled out from the fitting portion 11 is integrally extended. Also good.
[0042]
In the conduit connecting device 1 configured as described above, the first conduit 2 in which the coupling ring member 9 and the shield member 4 are attached to the outer peripheral portion, and the annular shape formed in the lock space portion 12c of the fitting space portion 12. Joining with the second conduit 3 in which the stopper member 6 is held in the recess 13 and held by the holding seal 7 is performed. In the conduit connection device 1, the first conduit 2 is inserted into the opening space portion 12 a of the fitting space portion 12 formed in the fitting portion 11 at the distal end portion thereof. In the conduit connecting device 1, the opening space portion 12 a has a large diameter, thereby having a call-in action, and the first conduit 2 can be fitted to the second conduit 3 very easily.
[0043]
In the conduit connecting device 1, as described above, each stopper member 6 is held at the first position accommodated in the annular recess 13 by the holding seal 7, so that the stopper convex portion 8 of the first conduit 2. Is allowed to pass through the lock space 12c. In the conduit connecting device 1, the first conduit 2 is pushed into the second conduit 3 until the stopper convex portion 8 at the tip thereof passes through the lock space portion 12 c of the fitting space portion 12. In the conduit connecting device 1, the holding seal 7 is peeled off from the second conduit 3 in this state and taken out from the second conduit 3.
[0044]
In the conduit connection device 1, a part of the stopper member 6 (for example, the stopper member 6 a) that is located on the upper side and accommodated in the annular recess 13 in the joined state is stored in the annular recess 13 by gravity. It escapes from the position and extends around the outer periphery of the first conduit 2. In the conduit connecting device 1, the stopper member 6 a is moved to the second position where the stopper convex portion 8 is locked by the operation of a so-called drop key, and the first conduit 2 is removed from the second conduit 3. Stop. In the conduit connection device 1, the stopper member 6 does not have a structure that prevents the first conduit 2 from being detached by locking the stopper convex portion 8 over the entire circumference. However, since the conduit connecting device 1 is structured to be locked in at least a half or more region, the function of preventing the separation of the first conduit 2 is achieved with sufficient mechanical strength.
[0045]
In the conduit connection device 1, the holding seal 7 is peeled off from the first conduit 2 in advance, and the stopper member 6 is moved from the first position to the second position so as not to apply a large vibration or the like. It may be left. In the conduit connection device 1, as described above, the inclined guide surface 8 a is formed on the outer peripheral surface of the stopper convex portion 8, and the counterbore 16 is formed on the stopper member 6. Therefore, in the conduit connection device 1, as the first conduit 2 is pushed into the second conduit 3, the inclined guide surface 8 a of the stopper convex portion 8 enters the counterbore 16 and the stopper member 6 is moved to the second portion. It is possible to pass by moving from the position to the first position.
[0046]
In the conduit connecting device 1, the guide hole 9 c of the coupling ring member 9 attached to the first conduit 2 is aligned with the guide hole 14 a formed in the flange portion 14 of the second conduit 3. In the conduit connection device 1, the bolt 10 is inserted through the guide hole 9 c of the coupling ring member 9, and the tip thereof protrudes from the guide hole 14 a of the flange portion 14. In the conduit connection device 1, the nut 15 is screwed into the tip of the through bolt 10, whereby the coupling ring member 9 is gradually drawn toward the flange portion 14 on the outer peripheral portion of the first conduit 2.
[0047]
In the conduit connecting device 1, the pushing projection 9 d hits the sealing member 4 as the connecting ring member 9 moves, and presses the sealing member 4 toward the second conduit 3. In the conduit connection device 1, the sealing member 4 is formed in a wedge shape as described above, and is gradually pushed into the fitting space portion 12 from the tip portion 4 b side as it is pressed. In the conduit connection device 1, the pressed sealing member 4 is elastically deformed between the inner peripheral surface of the fitting space portion 12 and the outer peripheral portion of the first conduit 2, and the entire length of the sealing member 4 is within the length range. By closely contacting, the space between them is securely sealed.
[0048]
In the conduit connecting device 1, the first conduit 2 and the second conduit 3 are coupled between the coupling ring member 9 and the flange portion 14 over the entire circumference via bolts 10 and nuts 15. This ensures that the fitting state is maintained. Therefore, in the conduit connection device 1, even when a tensile force is applied to the first conduit 2 or the second conduit 3 due to vibration, ground subsidence, or the like, the occurrence of pipe removal or loosening is reliably prevented. In the conduit connection device 1, the structure is achieved by providing a separation preventing function for maintaining a fitting state and a sealing function for maintaining watertightness and airtightness between the first conduit 2 and the second conduit 3. Is simple and the work efficiency is improved, and the connection work is performed.
[0049]
In the conduit connection device 1, for example, when re-pipe work is performed, after the through-bolt 10 and the nut 15 are loosened and the through-bolt 10 is removed from the coupling ring member 9, the coupling ring member 9 is the first one. The outer periphery of the conduit 2 is moved. In the conduit connection device 1, an operation of extracting the shield member 4 from the fitting space portion 12 of the second conduit 3 is performed. In the conduit connecting device 1, in this state, a jig is inserted into the fitting space portion 12 and the stopper member 6 in the second position is pushed up to the first position in the annular recess 13.
[0050]
In the conduit connection device 1, an operation of pulling out the first conduit 2 from the second conduit 3 is performed in a state where the stopper member 6 is moved to the first position. In the conduit connection device 1, the stopper member 6 is moved to the first position accommodated in the annular recess 13, so that the stopper projection 8 passes through the lock space 12 b without being locked. The first conduit 2 is withdrawn from the second conduit 3. In the conduit connection device 1, for example, when the stopper member 6 is formed of a magnetic material such as iron, the stopper member 6 is moved to the second position by bringing a magnet or the like closer to the outer periphery of the second conduit 2. It is also possible to move from to the first position.
[0051]
In the conduit connection device 1, as described above, the stopper member 6 at the second position is partially moved to the first position in the annular recess 13 against the gravity. The operation of releasing the locked state of the first conduit 2 with respect to the second conduit 3 by the stopper member 6 is performed. Therefore, in the conduit connection device 1, the depiping operation is performed very easily, and the working efficiency is greatly improved.
[0052]
【The invention's effect】
As described above in detail, according to the conduit connecting device according to the present invention, one of the plurality of stopper members incorporated in the second conduit in a state where the first conduit is fitted to the second conduit. The part moves to the first conduit side by gravity and exhibits a separation preventing function. However, the stopper member is moved to the first position from the second position against the gravity by the second operation by a very simple operation. By performing the operation of releasing the locked state of the first conduit with respect to the conduit, the work efficiency of the de-piping work is greatly improved during the re-pipe work or the like, and the construction cost can be reduced. Further, according to the conduit connection device, the number of parts can be reduced and the cost can be reduced by eliminating the need for the ring-shaped centering rubber member.
[Brief description of the drawings]
FIG. 1 is an exploded cross-sectional view of a main part of a conduit connection device shown as an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of an essential part of the conduit connection device.
FIG. 3 is an exploded perspective view of a main part of the conduit connection device.
FIG. 4 is a longitudinal sectional view of an essential part for explaining a movement operation of a stopper member in a second conduit in the conduit connecting device.
FIG. 5 is a longitudinal sectional view of a main part of a conventional conduit connection device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conduit connection apparatus, 2 1st conduit, 3 2nd conduit, 4 Shield member, 6 Stopper member, 7 Holding seal, 8 Stopper convex part, 9 Coupling ring member, 10 Through bolt, 11 Fitting part, 12 Fitting Space section, 13 annular recess, 14 flange section, 15 nut, 16 spot facing

Claims (4)

A first conduit on the fitting side provided with a stopper projection around the circumference on the tip side;
A fitting space portion in which the tip portion of the first conduit is fitted to the tip portion is formed, and a second recess on the receiving side in which an annular recess is formed on the inner peripheral surface of the inner position of the fitting space portion. A conduit of
It is formed in a generally cylindrical shape by an elastic material, and the outer diameter of the base end portion is slightly larger than the opening diameter of the fitting space portion of the second conduit, and the wall thickness is gradually reduced toward the distal end side. A shield member that seals between the outer peripheral portion of the first conduit and the inner peripheral surface of the fitting space portion of the second conduit by closely contacting between them,
A first coupling portion provided movably on the first conduit, and a second coupling portion provided axially fixed on the second conduit, and the first coupling portion and the second coupling portion By fastening the two coupling portions, the fitting state of the first conduit and the second conduit is maintained, and the shield member is moved into the fitting space portion of the second conduit by the first coupling portion. Coupling means to push in,
A first position allowing passage of the stopper convex portion of the first conduit while being accommodated in the annular concave portion of the second conduit; and A plurality of arc-shaped stopper members that are moved to a second position that locks the stopper projection by extending around the circumference;
A holding member for holding each stopper member at a first position housed in an annular recess of the second conduit;
By removing the holding member in a state where the first conduit is fitted in the fitting space of the second conduit, a part of each stopper member is moved from the first position by gravity to the stopper convex portion. By moving to the second position for locking the first conduit, the first conduit is connected to the second conduit so that the first conduit is prevented from coming off and sealed. 2. The conduit connection device according to claim 1, wherein each of the stopper members extends to an outer peripheral portion of the first conduit over at least a half or more region in the second position. The said 1st coupling | bond part and a 2nd coupling | bond part or at least any one are formed by the said 1st conduit | pipe or the said 2nd conduit | pipe and another member, The Claim 1 or Claim 2 characterized by the above-mentioned. The conduit connection device described. 4. The conduit connection device according to claim 1, wherein at least one of the first conduit and the second conduit constitutes a connection pipe member. 5.

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